Angenommen du willst den Traffic von Gi0/1 auf Gi0/2 spiegeln
Switch(config)# monitor session 1 source interface Gi0/1
Switch(config)# monitor session 1 destination interface Gi0/2
Switch(config)# exit
Switch# show monitor session 1
Session 1
---------
Type : Local Session
Source Ports :
Both : Gi0/1
Destination Ports : Gi0/2
Encapsulation : Native
Ingress : Disabled